Datatable:
----------
DataTables are also used to handle large amount of data for specific steps.

Types:
-------
1D without header
2D without header
1D with header
2D with header

Note:
------
1D-one Dimensional 

List<String>emp=new ArrayList<String>()
List<ArrayList<String>>emp=new ArrayList<ArrayList<String>>()
Map<String,String>emp=new LinkedHashMap<String,String>()
List<LinkedHashMap<String,String>>emp=new ArrayList<LinkedHashMap<String,String>>();